<template>
    <div>
        <!-- 面包屑导航区域 -->
        <el-breadcrumb separator="/">
            <el-breadcrumb-item :to="{ path: '/home' }">首页</el-breadcrumb-item>
            <el-breadcrumb-item>商品管理</el-breadcrumb-item>
            <el-breadcrumb-item>参数列表</el-breadcrumb-item>
        </el-breadcrumb>

        <!-- 卡片视图区域 -->
        <el-card>
            <el-alert title="注意：只允许为第三级分类设置相关参数！" type="warning" :closable="false" show-icon></el-alert>

            <!-- 选择商品分类区域 -->
            <el-row class="cat_opt">
                <el-col>
                    <span>选择商品分类：</span>
                    <!-- 级联选择框 -->
                    <el-cascader v-model="selectedCateKeys" :options="catelist" :props="cateProps" @change="handleChange"></el-cascader>
                </el-col>
            </el-row>

            <!-- tab 页签区域 -->
            <el-tabs v-model="activeName" @tab-click="handleTabClick">
                <!-- 添加动态参数的面板 -->
                <el-tab-pane label="动态参数" name="many">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 动态参数的表格 -->
                    <el-table :data="manyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染的Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleColse(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column prop="attr_name" label="参数名称"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
                <!-- 添加静态属性的面板 -->
                <el-tab-pane label="静态属性" name="only">
                    <el-button type="primary" size="mini" :disabled="isBtnDisabled" @click="addDialogVisible = true">添加属性</el-button>
                    <!-- 静态属性的表格 -->
                    <el-table :data="onlyTableData" border stripe>
                        <!-- 展开行 -->
                        <el-table-column type="expand">
                            <template slot-scope="scope">
                                <!-- 循环渲染的Tag标签 -->
                                <el-tag v-for="(item, i) in scope.row.attr_vals" :key="i" closable @close="handleColse(i, scope.row)">{{item}}</el-tag>
                                <!-- 输入的文本框 -->
                                <el-input class="input-new-tag" v-if="scope.row.inputVisible" v-model="scope.row.inputValue" ref="saveTagInput" size="small" @keyup.enter.native="handleInputConfirm(scope.row)" @blur="handleInputConfirm(scope.row)"></el-input>
                                <!-- 添加按钮 -->
                                <el-button v-else class="button-new-tag" size="small" @click="showInput(scope.row)">+ New Tag</el-button>
                            </template>
                        </el-table-column>
                        <el-table-column type="index" label="#"></el-table-column>
                        <el-table-column prop="attr_name" label="属性名称"></el-table-column>
                        <el-table-column label="操作">
                            <template slot-scope="scope">
                                <el-button type="primary" icon="el-icon-edit" size="mini" @click="showEditDialog(scope.row.attr_id)">编辑</el-button>
                                <el-button type="danger" icon="el-icon-delete" size="mini" @click="removeParams(scope.row.attr_id)">删除</el-button>
                            </template>
                        </el-table-column>
                    </el-table>
                </el-tab-pane>
            </el-tabs>
        </el-card>

        <!-- 添加动态参数/静态属性的对话框 -->
        <el-dialog :title="'添加' + titleTxt" :visible.sync="addDialogVisible" width="50%" @close="addDialogClosed">
            <el-form ref="addFormRef" :model="addForm" label-width="100px" :rules="addFormRules">
                <el-form-item :label="titleTxt" prop="attr_name">
                    <el-input v-model="addForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="addDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="addParams">确 定</el-button>
            </span>
        </el-dialog>

        <!-- 修改动态参数/静态属性的对话框 -->
        <el-dialog :title="'修改' + titleTxt" :visible.sync="editDialogVisible" width="50%" @close="editDialogClosed">
            <el-form ref="editFormRef" :model="editForm" label-width="100px" :rules="editFormRules">
                <el-form-item :label="titleTxt" prop="attr_name">
                    <el-input v-model="editForm.attr_name"></el-input>
                </el-form-item>
            </el-form>
            <span slot="footer" class="dialog-footer">
                <el-button @click="editDialogVisible = false">取 消</el-button>
                <el-button type="primary" @click="editParams">确 定</el-button>
            </span>
        </el-dialog>
    </div>
</template>

<script>
export default {
    data() {
        return {
            // 商品分类列表
            catelist: [],
            // 级联选择框的配置对象
            cateProps: { 
                expandTrigger: 'hover',
                value: 'cat_id',
                label: 'cat_name',
                children: 'children'
            },
            // 级联选择框绑定的数据
            selectedCateKeys: [],
            // 被激活的页签的名称
            activeName: 'many',
            // 动态参数的数据
            manyTableData: [],
            // 静态属性的数据
            onlyTableData: [],
            // 控制添加对话框的显示与隐藏
            addDialogVisible: false,
            // 添加动态参数/静态属性的数据对象
            addForm: {},
            // 添加动态参数/静态属性的验证规则对象
            addFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            // 控制修改参数的对话框的显示与隐藏
            editDialogVisible: false,
            // 修改动态参数/静态属性的数据对象
            editForm: {},
            // 修改动态参数/静态属性的验证规则对象
            editFormRules: {
                attr_name: [
                    { required: true, message: '请输入参数名称', trigger: 'blur' }
                ]
            },
            // 控制动态tag标签的按钮和文本框的显示与隐藏
            inputVisible: false,
            // 控制动态tag标签的文本框输入内容
            inputValue: ''
        }
    },
    created() {
        this.getCateList();
    },
    methods: {
        // 获取所有的商品分类列表
        async getCateList() {
            const { data: res } = await this.$http.get('categories');
            
            if (res.meta.status !== 200) {
                return this.$message.error('获取商品分类失败！');
            }

            this.catelist = res.data;
            // console.log(this.catelist);
        },
        // 监听级联选择框的变化事件
        handleChange() {
            this.getParamsData();

        },
        // 监听tab页签的点击事件
        handleTabClick() {
            // console.log(this.activeName);
            this.getParamsData();
        },
        // 获取参数列表的数据
        async getParamsData() {
            if (this.selectedCateKeys.length !== 3) {
                // 选中的不是三级分类
                this.selectedCateKeys = [];
                this.manyTableData = [];
                this.onlyTableData = [];
                return
            }
            // console.log(this.selectedCateKeys);

            // 根据所选分类的id和当前所处的面板，获取对应的参数
            const { data: res} = await this.$http.get(`categories/${this.cateId}/attributes`, {
                params: { sel: this.activeName }
            });
            if (res.meta.status !== 200) {
                return this.$message.error('获取参数列表失败！');
            }
            
            // console.log(res.data);
            // 循环渲染动态Tab标签
            res.data.forEach(item => {
                item.attr_vals = item.attr_vals ? item.attr_vals.split(' ') : [];
                item.inputVisible = false; //控制文本框的显示与隐藏
                item.inputValue = '' //文本框输入的内容
            });
            
            if (this.activeName === 'many') {
                this.manyTableData = res.data;
            } else {
                this.onlyTableData = res.data;
            }
        },
        // 监听添加属性对话框的关闭事件
        addDialogClosed() {
            // 清空文本
            this.$refs.addFormRef.resetFields();
        },
        // 点击添加
        addParams() {
            this.$refs.addFormRef.validate(async valid => {
                if (!valid) return this.$message.error('参数预验证失败！');

                const { data: res } = await this.$http.post(`categories/${this.cateId}/attributes`, {
                    attr_name: this.addForm.attr_name,
                    attr_sel: this.activeName
                });
                if (res.meta.status !== 201) {
                    return this.$message.error('添加参数失败！');
                }
                this.$message.success('添加参数成功！');
                this.getParamsData();
                this.addDialogVisible = false;
            });
        },
        // 点击展示修改参数的对话框
        async showEditDialog(attr_id) {
            const { data: res } = await this.$http.get(`categories/${this.cateId}/attributes/${attr_id}`, {
                params: { attr_sel: this.activeName }
            });

            if (res.meta.status !== 200) {
                this.$message.error('获取参数信息失败！');
            }
            this.editForm = res.data;
            this.editDialogVisible = true;
        },
        // 监听修改对话框的关闭事件
        editDialogClosed() {
            this.$refs.editFormRef.resetFields();
        },
        // 点击修改
        editParams() {
            this.$refs.editFormRef.validate(async valid => {
                if (!valid) return this.$message.error('参数信息预验证失败！');

                const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${this.editForm.attr_id}`, {
                    attr_name: this.editForm.attr_name,
                    attr_sel: this.activeName
                });
                if (res.meta.status !== 200) {
                    return this.$message.error('修改分类信息失败！');
                }

                this.$message.success('修改分类信息成功！');
                // 刷新页面
                this.getParamsData();
                // 关闭对话框
                this.editDialogVisible = false;
            });
        },
        // 点击删除
        async removeParams(attr_id) {
            // 弹窗提示
            const confirmResult = await this.$confirm('此操作将永久删除该参数, 是否继续?', '提示', {
                confirmButtonText: '确定',
                cancelButtonText: '取消',
                type: 'warning'
            }).catch(err => { //catch捕获错误
                return err;
            });
            if (confirmResult !== 'confirm') {
                this.$message.info('已取消了删除！');
            }

            const { data: res } = await this.$http.delete(`categories/${this.cateId}/attributes/${attr_id}`);
            if (res.meta.status !== 200) {
                this.$message.error('删除参数失败！');
            }
            this.$message.success('删除参数成功！');
            // 刷新列表
            this.getParamsData();
        },
        // 监听参数标签事件
        handleInputConfirm(row) {
            if (row.inputValue.trim().length === 0) { //输入内容不和法
                row.inputValue = ''; //清空值
                row.inputVisible = false; //关闭输入框
                return
            }

            // 内容合法，发送请求添加
            row.attr_vals.push(row.inputValue.trim());
            row.inputValue = ''; 
            row.inputVisible = false;
            // 发送请求
            this.saveAttrVals(row);
        },
        // 将对 attr_vals 的操作保存到数据库中
        async saveAttrVals(row) {
            const { data: res } = await this.$http.put(`categories/${this.cateId}/attributes/${row.attr_id}`, {
                attr_name: row.attr_name,
                attr_sel: row.attr_sel,
                attr_vals: row.attr_vals.join(' ')
            });
            if (res.meta.status !== 200) {
                return this.$message.error('修改参数项失败！');
            }
            this.$message.success('修改参数项成功！');
        },
        // 点击展示文本输入框
        showInput(row) {
            row.inputVisible = true;
            // 让文本框自动获得焦点
            // $nextTick 方法的作用，就是当页面上元素被重新渲染之后，才会执行回调函数中的代码
            this.$nextTick(_ => {
                this.$refs.saveTagInput.$refs.input.focus();
            });
        },
        // 监听参数的删除事件
        handleColse(i, row) {
            row.attr_vals.splice(i, 1);
            // 发送请求，保存操作
            this.saveAttrVals(row);
        }
    },
    computed: {
        // 如果添加按钮需要被禁用返回true， 否则返回false
        isBtnDisabled() {
            if(this.selectedCateKeys.length !== 3) {
                return true;
            }
            return false;
        },
        // 当前选中的三级分类的id
        cateId() {
            if (this.selectedCateKeys.length  === 3) {
                return this.selectedCateKeys[2];
            }
            return null;
        },
        // 动态计算标题的文本
        titleTxt() {
            if (this.activeName === 'many') {
                return '动态参数';
            }
            return '静态属性';
        }
    }
}
</script>

<style lang="less" scoped>
.cat_opt {
    margin: 15px;
}

.el-tag {
    margin: 10px;
}

.button-new-tag,
.input-new-tag {
    margin: 15px;
}

.input-new-tag {
    width: 120px;
}
</style>
